COMPOUND
PRESSURE GAGE
C
TO SUCTION
SERVICE VALVE
PIPER
CHEROKEE SIX
SERVICE MANUAL
408
HIGH PRESSURE
GAGE
TO DISCHARGE
SERVICE VALVE
TO VACUUM PUMP OR
REFRIGERANT CYLINDER
Figure
13-3. Test Gauge
and Manifold Set
13-8.. TEST GAUGE AND MANIFOLD SET. The proper testing and diagnosis of the air
conditioning
system require that a manifold gauge
set be attached into the system. This
set
consists of two gauges mounted to a manifold. One gauge is a high pressure gauge used in
the discharge side of the system. The other is a low pressure gauge used in the suction side
of the system. The manifold is a device having fittings for both gauges and connection hoses
with provisions for
controlling the flow of refrigerant through
the manifold. See Figures
13-3 and 134.
The
center port of the manifold set is used
for charging or evacuation procedures,
or any
other service that may be necessary.
Both
the high and low side of the manifold
have hand shut-off valves. When
the hand
valve is turned all the way in, in a clockwise direction, the manifold is closed. The pressures
on that side of the system will. however, be recorded on the gauge above the hose.
Cracking
the hand valve, in the counterclockwise
direction, opens the system
to the
middle service port of the manifold set. This is desirable only when it is necessary to let
refrigerant out or into the system. Refer to Figures 13-3 and 134.
13-9. CHECKING THE SYSTEM FOR LEAKS. There are several methods of doing this
operation, depending on the type of equipment which is available. Two methods of
performing this check will be covered in the following paragraphs.
ACCESSORIES AND UTILITIES
Issued:
8/17/72
3G17
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